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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
Published on: September 5, 2019
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Chaos and bipartite entanglement between Bose-Josephson junctions
1Department of Chemistry, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel.
Physical Review. E
|January 21, 2023
Summary
We studied entanglement in bosonic Josephson junctions, linking it to classical chaos. Chaos-supported states show specific entanglement structures, unlike regular states, revealing insights into quantum chaos.
Area of Science:
- Quantum physics
- Quantum information theory
- Condensed matter physics
Background:
- Bosonic Josephson junctions exhibit complex dynamics.
- The interplay between classical chaos and quantum entanglement is a key research area.
- Understanding entanglement in many-body systems is crucial for quantum technologies.
Purpose of the Study:
- To investigate the relationship between classical phase space structure and quantum entanglement in bosonic Josephson junctions.
- To analyze the symmetry-resolved entanglement spectra and entropy of energy eigenstates.
- To compare the entanglement properties of eigenstates in regular and chaotic regions.
Main Methods:
- Calculation of symmetry-resolved entanglement spectra.
- Bipartite entanglement entropy analysis of energy eigenstates.
- Comparison with random state predictions and Generalized Gibbs Ensemble (GGE) microcanonical structure.
Main Results:
- Chaos-supported eigenstates exhibit entanglement spectra matching GGE microcanonical structure, influenced by an adiabatic invariant.
- Symmetry-resolved entanglement entropy shows a mean-field term and a fluctuation correction.
- Total bipartite entanglement entropy correlates with the chaoticity of eigenstates.
- Island-supported eigenstates represent macroscopic Schrödinger cat states with reduced entanglement.
Conclusions:
- Quantum entanglement in bosonic Josephson junctions is strongly influenced by underlying classical chaos.
- The study provides a framework for understanding entanglement in systems with mixed phase space.
- Findings offer insights into the nature of quantum chaos and its impact on quantum information properties.
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